Figure 2From: Small bowel gastrointestinal stromal tumours and ampullary cancer in Type 1 neurofibromatosisPhotomicrograph showing Gastrointestinal stromal tumours a) Bland spindle cells arranged in a storiform pattern set within muscle wall with no necrosis, mitotic figures or pleomorphism seen. (Haematoxylin and Eosin × 100) b) Positive staining with CD 117 (×100) c) Negative staining with S100 (× 100) d) Positive staining with CD34 (× 100)Back to article page